Graphic user interface for a portion of a display panel



The FIGURE is a front view of a graphic user interface for a portion of a display panel.

The broken lines showing a portion of the display panel and the broken lines within the graphic user interface depict environmental subject matter only and form no part of the claimed design.

The shades of gray represent a contrast in appearance. 

The ornamental design for a graphic user interface for a portion of a display panel, as shown and described. 